X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Flyr_std%2Frotate.cpp;h=fd13f92394f7c1a6c17e36bd7c63032cb670ac05;hb=9459638ad6797b8139f1e9f0715c96076dbf0890;hp=39dcbf4dd21db2234a911dcd5317ef78af933a15;hpb=69dec3923341f50673aeb5a7d61aa0f7e1bf74e5;p=synfig.git

diff --git a/synfig-core/trunk/src/modules/lyr_std/rotate.cpp b/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
index 39dcbf4..fd13f92 100644
--- a/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
+++ b/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
@@ -228,6 +228,11 @@ Rotate::accelerated_render(Context context,Surface *surface,int quality, const R
 	Real pw=(renddesc.get_w())/(renddesc.get_br()[0]-renddesc.get_tl()[0]);
 	Real ph=(renddesc.get_h())/(renddesc.get_br()[1]-renddesc.get_tl()[1]);
 
+	// we're going to round the canvas size to an integer number of pixels, so round the
+	// tl-br rectangle accordingly - otherwise we see the jittering described in bug 2152666
+	br[0] -= (pw*(br[0]-tl[0]) - round_to_int(pw*(br[0]-tl[0]))) / pw;
+	br[1] -= (ph*(br[1]-tl[1]) - round_to_int(ph*(br[1]-tl[1]))) / ph;
+
 	RendDesc desc(renddesc);
 	desc.clear_flags();
 	//desc.set_flags(RendDesc::PX_ASPECT);